Rhodopsin is the molecule responsible for the reception of light in the rod cells of the mammalian retina. Absorption of a photon changes the 11-cis-retinal part of the molecule to all-trans-retinal. The molecule absorbs light most strongly at a wavelength of 510 nm, but can be excited by light of wavelength up to about 630 nm. What is the minimum amount of energy required to change from one isomer to another?

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HC CH2 HỌC CH, CH3 CH3 CH3 Н. С CH₂ H Absorption of a photon 11-cis-Retinal CH2 H All-trans-retinal